diff --git a/src/test/kotlin/com/fasterxml/jackson/module/kotlin/KotlinModuleTest.kt b/src/test/kotlin/com/fasterxml/jackson/module/kotlin/KotlinModuleTest.kt
index 3c90dba06..5a7e7de79 100644
--- a/src/test/kotlin/com/fasterxml/jackson/module/kotlin/KotlinModuleTest.kt
+++ b/src/test/kotlin/com/fasterxml/jackson/module/kotlin/KotlinModuleTest.kt
@@ -46,7 +46,7 @@ class KotlinModuleTest {
             enable(NullToEmptyMap)
             enable(NullIsSameAsDefault)
             enable(SingletonSupport)
-            enable(StrictNullChecks)
+            enable(NewStrictNullChecks)
             enable(KotlinPropertyNameAsImplicitName)
             enable(UseJavaDurationConversion)
         }.build()
@@ -100,7 +100,7 @@ class KotlinModuleTest {
     @Test
     fun builder_EnableStrictNullChecks() {
         val module = KotlinModule.Builder().apply {
-            enable(StrictNullChecks)
+            enable(NewStrictNullChecks)
         }.build()
 
         assertTrue(module.strictNullChecks)
@@ -114,7 +114,7 @@ class KotlinModuleTest {
             enable(NullToEmptyMap)
             enable(NullIsSameAsDefault)
             enable(SingletonSupport)
-            enable(StrictNullChecks)
+            enable(NewStrictNullChecks)
         }.build()
 
         val serialized = jdkSerialize(module)
diff --git a/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/StrictNullChecksTestOld.kt b/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/StrictNullChecksTestOld.kt
index bbb15895e..ec82ee926 100644
--- a/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/StrictNullChecksTestOld.kt
+++ b/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/StrictNullChecksTestOld.kt
@@ -1,9 +1,8 @@
 package com.fasterxml.jackson.module.kotlin.test
 
-import com.fasterxml.jackson.databind.ObjectMapper
-import com.fasterxml.jackson.module.kotlin.KotlinFeature.StrictNullChecks
+import com.fasterxml.jackson.module.kotlin.KotlinFeature
 import com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException
-import com.fasterxml.jackson.module.kotlin.kotlinModule
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import com.fasterxml.jackson.module.kotlin.readValue
 import org.junit.jupiter.api.Assertions.assertArrayEquals
 import org.junit.jupiter.api.Assertions.assertEquals
@@ -13,7 +12,10 @@ import org.junit.jupiter.api.assertThrows
 import kotlin.test.assertNull
 
 class StrictNullChecksTestOld {
-    private val mapper = ObjectMapper().registerModule(kotlinModule { enable(StrictNullChecks) })
+    private val mapper = jacksonObjectMapper {
+        disable(KotlinFeature.NewStrictNullChecks)
+        enable(KotlinFeature.StrictNullChecks)
+    }
 
     /** collection tests */
 
diff --git a/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/GitHub757.kt b/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/GitHub757.kt
index f9c00f50a..0245c9b85 100644
--- a/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/GitHub757.kt
+++ b/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/GitHub757.kt
@@ -11,7 +11,7 @@ class GitHub757 {
     @Test
     fun test() {
         val kotlinModule = KotlinModule.Builder()
-            .enable(KotlinFeature.StrictNullChecks)
+            .enable(KotlinFeature.NewStrictNullChecks)
             .build()
         val mapper = JsonMapper.builder()
             .addModule(kotlinModule)